You can only play this if you access google.com using the Chrome browser and have no internet connection. This game seems to be a way to please Google search users who have internet connection issues.

To play this game, you need to click on the dinosaur pixel. You may adjust the speed as well based on the available speed button.

After you click on the dinosaur, press space, and the game will start.

Press space to jump.

You can also duck to avoid pterodactyls by pressing the down arrow.